I dont use Rinkya because...honestly, my head 
almost exploded when I tried to read (and 
understand) their fees page. To me it seemed 
really too high, and if I get flamed or banned 
for this, then so be it.  ID love to bid real 
time, but not for those fees.  I use Celga all 
the time.  I think their fees are reasonable.  
While you cant bid real time, they havent failed 
me yet!  There are also some other dep services 
out there who will bid for small fees.