I used this guy in the past. They deal clevo.

https://configurelaptop.eu/

Great service.

I have some preferences in hardware (Vendors are still riding the 4k-in-laptop-size bandwagon) and Thinkpad has good customizability.

Just looked into Malibal, they have no less than WQHD currently and i get a top of the line customized Thinkpad for less than their 2000+.

Side question since a lot of people knowledgeable about Thinkpads are here. What's a good used thinkpad model that can support remastered classic games like StarCraft and Quake II? All my linux distros are on HP and MSI hand-me-downs that are starting to break down, and I've been wanting to get a cheap, used thinkpad.

Look at the prices.

I didn't know about Starlabs but apparently THEY HAVE SHIPMENTS TO MEXICO YES!!! regarding your question these are these major reasons:

• for the most purists, the vendor should have a certificate from FSF saying that "it respects your freedom" a thing that almost no company have (at least that's what I saw in modern vendors)
• in my case and other regions, it's way more probably you can get a Thinkpad easily and more cheap than one from those mentioned

Had a bad experience with System76 in the past.

I've always kinda wondered what System76's stuff is like. Battery life'd be the main priority for my use case. (I really like my M2 Air for this)