To be honest with you i'm not sure if this forum has a search feature but i really couldn't tell you for sure.
Even if it did, it seems that any thread that is not within the first page has most likely been long forgotten by its creator sadly. Heck even one that I found about 15 topics down was vacated by the seller it seems, at least he hasn't made any indication as to existence within the last 3 or 4 days.
So basically my answer is no there is no search, but since you only really need to look at the thread titles of the first 30 or so topics, that doesn't make too much of a difference.
If theres something specific that you are looking to purchase you can always start a thread stating that you want to buy that item, and i would include the price you are willing to pay for said item.