The cheapest option is to buy bulk. Estate sales, shopgoodwill are fun ways to find albums. You’d spend 30 bucks for 10 or so albums, and some will sure be good quality. Used record stores are the second best option. All my favorite and best sounding records cost less than $10.
There are labels I avoid and some that I trust but it might be subjective. CBS, Decca, Columbia, Atlantic, PolyGram, Jet are all decent