Or -- if you're not going to do parametric search (and deciding not to is absolutely a valid decision -- reviewing an entire database is a huge undertaking), at least have the parts organized in some hierarchical, traversable manner.
Old time example being a catalog. Usually with broad part families (passives, actives, mechanical, power...), categories within those (resistors, capacitors; transistors, ICs; etc.), further sub-categories if needed, and then by manufacturer, or by ratings and type, or etc. (I'm guessing manufacturer won't be such a big player, with almost everything branded Tandy already!)
With an index or table of contents at the front, and the beginning of each section (and for the web or PDF version, make sure these are hyperlinked -- and don't use those STUPID "web catalog" things, they're slow and they SUCK!), navigation in printed or electronic form is pretty simple, even if you can't really search parametrically on what you're looking for. Do include as many parameters as possible in the selection tables themselves; I hate nothing more than catalogs with a table of Part Number, Price, maybe a Figure reference, and NO DATA. How the hell am I supposed to make a choice between these?! Blah!
When organized in this way, the user can usually find something based on a vague idea of objective. A "close enough" keyword can end up in the right general area at least, which is why in-order traversal is important (I want a resistor, but not a power resistor, just a regular one, so it must be *this* way.. *flips pages*).
And, thanks for having a dialog with some (hopefully useful) [potential] users of your website!
Tim