don't know much about cheap but rme audio have some really good ones!
e-mu, m-audio are cool too

The least expensive ADAT I/O card I have found is the Frontier Designs Dakota card ... streets for around $300.

http://www.jdsound.com/store/product1.asp?SID=2&Product_ID=449 this ones only 150$.. surely their is more out there for cheaper. its just 1 in 1 out. how hard can that be to make :)

Actually, I think that Terratec is about the cheapest. I considered that card, but then I found a great deal on a used RME Hammerfall 96/52 card. Haven't looked back.

E-Mu 1212M gets my vote. 2x ADAT jacks (8 in 8 out), AND you get the Pro-Tools HD series converters on 1/4" jacks (2 in 2 out). Even has cheap built in DSP for wet latency-free monitoring. $199 all day long at GC and Sweetwater.

FWIW - I just got the RME 9636 off eBay for $225 with 4x ADAT connections...

:cool: