Harbor Freight has a largeish "security bit set" that they frequently put on sale for like $8. It has Various non-security bits (philips, posidrive, slot, regular torx, regular hex) as well as numerous "security" bits (security torx, security hex, various variations on philips, etc.). It should have what you need. It had everything I've ever needed to take apart all the Konami cabinets I own, at least.