It's much harder to get a playing days Ruth card for under $300 these days. As others have mentioned, the Bulgaria and Josetti are still good priced options, but the eye appeal isn't as good because of another person on the card or that Ruth isn't in uniform. The Churchman, British American Tobacco, and Edward, Riggs cards look very nice, but are getting more expensive quickly. I think the Sanella might still be a good option to look into if you are willing to buy it raw. Here's one that recently sold for less than $150:
Link. The W512 used to be the one to get if you wanted a cheap version because it's so ugly and plentiful. However, even that card regularly goes above $500 these days. If your budget is less than $100, probably your only option is the 1935 Quaker Oats pin (in metal), that can often be found for $85 or so ungraded. PSA does encapsulate these in case you prefer these authenticated. Be careful of the ungraded non-metal ones as there are quite a bit of counterfeit ones out there. I've also recently started collecting 1936 BF3 pennants although it's a generic player image and not Ruth, and slightly past his playing days. However, a cheaper option than many cards these days, and SGC also encapsulates them.