Depends on the size of the crates, but here's what I'd suggest for a per-unit price, after taking into account the hit for selling on the black market:
Street-value for modern Bananas varies widely by location but I'd call it around $1 per kg here in the US, converting to kg to use the traditional metric units of the Sixth World. For Shadowrun, with the upheavals in the traditional growing areas for bananas and the general sky-rocketing prices of Real Food, I'd suggest giving them around 10¥ per kg, plus or minus the Face's intervention, of course.
Chocolates... well, depends on the quality. Assuming it's somewhere in the "deluxe to ultra-deluxe" range, since nobody else would bother with Genuine Chocolate, lets call it $35-$40 per kg for bulk "bricks," or the same amount per box for retail "assortment" type packaging. Much the same trouble affects chocolate as bananas, but they've managed to genetically engineer some pretty convincingly flavored substitutes so I'd suggest less of a mark-up... only around 50¥ per kg.
The condoms... well, I really doubt they'd get any more expensive in the future so, following the standard 1¥ = $1 rule, they'd retail legitimately for about $1 a condom for the ones with all the "special features" and far less for the generic, given-out-for-free-at-the-health-clinic variety. Call it 0.01¥ apiece, assuming they can even find a buyer.
