XC9572XL CPLD development board v1b are back in stock at Seeed Studio. CPLDs are programmable logic gate arrays which allow you to build custom logic devices simply by programing them.
Get the XC9572XL dev-board for $15 and CoolRunner-II development board for $15.
SeeedStudio is gone???
Gone? No, not as far as I know, site is still there, all appears normal. What makes you think they are gone?
5V tolerant I/O Pins – Yay!