The prices are not too heavy on the pocket and the service is brisk, efficient, and friendly.

pocket 的本义是"口袋"，在这里用作比喻，指"个人经济状况"或"钱包里的钱"。 heavy on the pocket 是一个固定短语，字面意思是"对口袋很重"，引申为"花费大、经济负担重"的意思。