here are some links which might help
Software
http://www.sphider.eu/index.php
http://www.php-development.ru/php-sc...rch-engine.php
http://php-scripts.poglej.net/
http://www.hotscripts.com/category/p...earch-engines/
Free Search Engine Script Hosting
http://www.freefind.com/
http://www.atomz.com/
http://sitelevel.whatuseek.com/
http://www.jrank.org/
the only problem i see is that you have 3 search criteria which will require programming of the database. the quick method would be to use one of the methods above.
another approach would be to use one of the above services for now. download zencart,
http://www.zen-cart.com/ an open source, template css based shopping cart. you could incorperate your template into it. work on it while your present site is up, then swap them out.