the companies who refuse to follow customer's shipping preferences.  

Based on my experience.  They choose USPS over my preferences for UPS or FedEx  OR They wont let customers choose...    
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Amazon.com - They almost always use USPS.  They have contract with USPS.    
Aliexpress.com - They failed my test!!!  I choose UPS Ground for small order.  The seller used USPS shipping.  They do not respect my shipping choice at all!!!  FUCK THAT SITE!!!      
https://ebay.com - They do not enforce shipping my shipping choices to the sellers.  They should have enforce sellers to print UPS shipping labels.  I wont buy on ebay anymore unless seller message and agree to ship via UPS or FedEx.     
https://zazzle.com - They wont listen to me!  They shipped using USPS.  I wont go to them ever again - posted 1 star review.    
https://medicalsource.com/  - I choose UPS Ground and they shipped using USPS - I will post 1 star reviews all over.  I hope USPS will drop it on my front door since it is large package (diapers and spoons)     
https://www.ebay.com/str/computerupgradeking - I choose UPS Ground on my order and they shipped using USPS.  They totally ignored my messages.   FUCK THAT SELLER!!!   
any websites named "Computer Upgrade King"  
Third Party Sellers on walmart.com that do not have their items at walmart fulfillment warehouses. They are likely to use USPS.  
"local" listings on temu - They do not give you shipping choices :(       
http://www.orientaltrading.com/ - they chose USPS on my walmart order.    
https://reolink.com  - They used USPS!! STUPID FUCKERS!!!!  WHY THEY WOULD USE USPS ON EXPENSIVE ORDER.....   
https://gamestop.com - ordered a small thing (glow in the dark dices) - They choose USPS for this order!!!  --- They shipped it in big box and lucky USPS dropped it at my front door as I requested.         


Companies not to order: 
https://expressmed.com - Once the order is accepted by the carrier it is unknown until then, we use UPS, FedEx and USPS. We are not able to choose that carrier.

BIG FUCK YOU TO COMPANIES who do not follow customer's choices for shipping carriers or allow customers to choose. 
NOT EVERYONE can have USPS delivered to them.   
    


The Companies that I love and use USPS alternatives (UPS or FedEx) or follow buyer's choices.  


https://walmart.com - they use FedEx and UPS on my orders.  make sure you order items that are fulfilled by Walmart.   
https://bestbuy.com - They always use FedEx and sometimes UPS on my orders.   
https://gamestop.com - FedEx - the last order was transferred to USPS... How fuck I upgrade smartpost packages to regular fedex delivery???  ---   Be caution...  if you order more than one thing. more chance for FedEx  
https://temu.com - make sure you do not order from "local" listings.  sellers will ship via USPS on those "local" listing.  longer wait thou.    
https://www.batteriesplus.com/  
https://hltattoosupply.com/
https://www.digitalbaytech.com/
https://vilros.com/
https://www.adafruit.com/
https://dynamiccolor.com/
https://ultimatetattoosupply.com/
https://www.painfulpleasures.com/
https://www.crocs.com/ - UPS  
https://www.bhphotovideo.com/
https://www.photonlight.com/
https://www.zwaveproducts.com/
https://www.thesmartesthouse.com/
https://newegg.com - they use UPS on all of my orders.  have to make sure you buy direct from newegg   
https://chewy.com - FedEx
https://lowes.com - FedEx
https://sandisk.com - UPS    
https://www.supplyhouse.com/ - UPS
https://www.medical-and-lab-supplies.com/   
https://christmasloft.com
https://www.countrychristmasloft.com/
https://www.batteryeliminatorkits.com/ 
https://www.grainger.com
https://www.saveritemedical.com/ - chosen UPS Ground - They wanted to ship via fedex. I allowed them to. - I am glad they communicated and asked me first!  
thethruster.com - I picked UPS 2 day - They fillfulled and shipped via UPS fast!      


https://www.empirebmx.com/ - they used fedex on my order.  
https://www.danscomp.com/ - they followed my order perfectly!   
https://stolenbrand.com/ 
https://www.skatepro.com/ - They stated that they ship via fedex  --- They are shipping from Denmark....   I had no idea that they are outside of USA  --- They shipped it fast!  I got it in a few days.
https://itinyc.com/ 



Companies to test
albes.com - put note in the order....  it has to be something bigger than mailbox....  
adwdiabetes.com - they said pay for faster shipping with FedEx  
http://www.medneedles.com/  - they stated that they use UPS