In that case, whatever you can safely spare would be OK. Priorities are still important!
Many silver buyers go with entire Troy ounces of silver each purchase (or each day in between purchases). It's possible to purchase silver in fractional amounts (usually 50c, 25c, and 10c out of $1); those US coins pre-1965 have 90% silver content.
Another option for USD is the Jefferson War Nickels from 1942 through 1945; silver content is only 35%, but 35% of 5 grams is still decent.
Gold is harder to come by on a micro level, but it's possible to buy even a 1/10th-ozT piece on a pay-as-you-go plan just so you have a stake. This is more of a face-to-face in person situation; for this, it would be necessary to find a coin dealer near you who you can trust or at least verify.
Even if you decide to decline, at least you know you have options better suited to your situation should you change your mind.
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Thank you! Those are all great suggestions for me! Is there an online source to buy old coins?
My experience in buying online is minimal to none, so I would defer to @silversaver888 for suggestions on where to go. However, it does make sense to start with eBay to find a vendor/dealer.
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