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You’d probably have to buy a package of a bunch, most stores don’t carry the old card packs they used to have, but you might get lucky and find some old stock, it really depends on the store. You can make a capacitor of any value by combining capacitors in series or parallel to get what you need.
Caps in parallel are additive in capacitance, and have the voltage rating of the lowest rated cap in the set.
c1 + c2 + c3 + cn = total
Caps in parallel is the most common approach. Remember to allow for the percent tolerance of the components – usually 20% for the low priced stuff.
Caps in series are (c1 X c2)/(c1 + c2), or
‘n’ means ‘keep going like this for how ever many you’ve got’