I don't have any experience and can't find any reviews on Official Call pants, but 75 shipped for plate and base pants isn't a bad deal if the pants are decent quality. Anyone ever seen them? Here's the link for 34s--Their store has other sizes at the same price.
2 Pair Brand New Umpire Pants - Plate & Base Sz 34 - eBay (item 280321197027 end time Apr-08-09 07:46:43 PDT)