Considering it will only be SpareDollar until June, sd98 will become outdated.
Personally, I would rather be a part of a Sunday Sale group separate from a listing service. I don't use, Auctiva's service. I've tried their service and that's why I praise it. I use a desktop service because it better suits my needs. Anyway, a sale group in and of itself would be more to my liking.
I'll be doing relists on Sundays, some starting at .95 and up to $5.00. I might call it my Super Sunday Sale! SSS for short. Or a better name if I can think of one. I wouldn't mind being part of a group, BUT all of the rules and nosey members might not be to my liking. It would depend. Let me know, if you put one together.