FWIW, when looking for old vehicles (private party sales only, as I assess the owner as much as the vehicle when buying), I use key words like "grandma", "grandpa", "low miles", etc.
You also preferably want something you can see maint records on, and a vehicle in seemingly good shape with a stack of repairs performed is generally better than the "I never had any problems, never had to fix anything" type vehicles. As those are generally the ones that owners are dumping rather than sticking money into for needed or relatively imminent repairs.
Last purchase yielded a 2001 Tahoe with only 105k miles on it for about $1000 less than book value. Seller had 2 more calls from people wanting to look at it just on the 15min test drive we went on. It is in quite good shape. But to be fair, even with this one, I've put about $500 into maint and small repairs which realistically would have easily cost 4-5x as much if all done in a repair shop.
To find the "right" vehicle, you have to be quick and have cash on hand (or at least earnest money). While you're looking for your next vehicle, there are many more folks doing the same and even more used car flippers that are very quick to act.
I'm providing my opinion on this, as "budget" vehicles can easily break your budget if they're not right.
Another good option in that class/age is a S10/S15 with the 4.3 V6. Pretty bulletproof engine, simple to work on and as any, if you can find a manual trans truck with a good clutch, it's better money spent than on an unknown auto trans, IMO.
