the SD and the IH are out there, but can be expensive. the DD, the KW, 352 and titan can be had reasonable, the astro 95 is hit or miss price-wise, some cheap, some expensive, depends on how you find them.
cheapest options are the KW K-123, Pete 352, Freightliner DD, and Chevy Titan 90, all are around the $35 mark as re-issues, all the other COE's can get expensive as it's been awhile since they have been issued. [just my experience]