I believe I've seen a Shimano Sora available in 165mm and 167.5 - these are relatively inexpensive.
Personally, I found some Shimano Ultegra (WAY nicer and lighter) on eBay, that are 167.5 and which I have received for my recumbent. I believe I paid $75 for them. You'll need to change your bottom bracket however. I ordered a Shimano 5500... it's an entry level bottom bracket, but has sealed cartridge ball bearings, plus extra needle bearings on the drive side. (needle bearings can withstand hundreds of times more pressure than ball bearings, and thus the crank lasts much longer).
Also look under the brands Truvativ and FSA... they may make some.
I'm assuming you don't want singlespeed cranks, which are easy to find in 165 but not compatible with narrow chains.
Here is an eBay search tip:
When you find any crankset on ebay, within the listing, at the top, you'll see what category it is under, such as:
Listed in category: Sporting Goods > Outdoor Sports > Cycling > Bicycle Parts > Road Bike Parts > Cranksets & Bottom Brackets
Here's the link for you:
http://sporting-goods.shop.ebay.com/...QQ_sacatZ56195
Click on it, and enter your search words.
Enter only the terms
165 and
double (or triple, but you'd be crazy to go with a triple instead of a compact double, because a triple sends your right foot out so much farther than the left, messing with the Q-factor), and check the box to search titles and description.
It's important that you go to the sub-category first, or you'll get thousands of unrelated products. This way, you find what you want.
You probably have a square taper, so make sure the crank you get has that as well. Beware, because there are cranksets for square taper (most common in used parts, and some new parts), ISIS (truvativ, fsa), Octalink (v1) and Octalink v2, and with external bearings (probably not compatible with an older frame).
Unless you want to swap the bottom bracket. In which case, get a 108-110 for a double, 113, for triple, crankset, and make sure it matches your frame's threading and bottom bracket shell width, and make sure the interface matches your crankset (splined ISIS, splined Octalink, splined Octalink v2, square japanese, square).