Those were my first two thoughts exactly. The Conlon Collection has a nice selection of shots of all 3 players, and will be high-quality photos (produced from the original glass plate negatives), but it sounds like they may be more pricey than what you're looking to spend.
Ebay is the other route, and at the opposite end of the spectrum in both price and (usually) quality. As in, they're usually cheap, and usually look that way. Almost all photos on eBay will be from screen grabs from auction sites or the Library of Congress which are printed with a desktop printer on (if you're lucky) photo paper. Just be sure to read through the feedback for whoever you're buying from, and judge that vs. the quality you need for your project.
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