I have a case, maybe more, of new DC300XLs for sale. $3 singles, 2 for $5, $10 for a box of 5, plus shipping. I also have used DC600s for $1 each The Tektronix 31 takes a custom small tape. I may have a few around. I used too but I haven't seen any lately. I will continue to look. Please reply to me directly at whoagiii(a)aol.com