Here is a kit for making senkos http://del-mart.com/store/product_info.php?cPath=54&products_id=112
This is a pretty good deal you get everything you need. You can get a cheaper senko mold that has one flat side but I would suggest just buying the aluminum oneto start out it makes an exact copy of the yamamoto.

e-man,
To start up I would say you could probably get a good little assortment of molds from www.lurecraft.com and a gallon of plactic a few colors of colorant and glitter for 100 or less. I am sure you could get it cheaper or much more expensive just depends of what exactly you want to get. It does really turn out to be much cheaper than buying pastics overall especially if you use many senkos! Call this # and request a free lure craft catalog 1-800-925-9088 they have alot of molds and colors but I highly suggest this plastic over the lure craft
http://del-mart.com/store/product_info.php?cPath=33_55&products_id=47
also check out these kits http://del-mart.com/store/index.php?cPath=54&osCsid=299b410111c1936d9d2ca0cea82ea795
the aluminum molds are much more expensive than anyother molds but...will out last them 100:1 they are great I use mostly alluminum molds now.

Hope this helps out abit

Taylor