Among the one million items for sale are numerous obligatory saffron robes, which range from 1,000 baht ($33) for synthetic threads for monks on a budget, to several thousand baht for those desirous of more sumptuous cotton robes.

At traditional monk supply shops, the mood is usually discreet, with products typically bearing no price tags. Hang Sangkapan puts a decidedly more Western spin on religious commerce. Customers are “members”—although no Costco-like fee is required—and get up to a 5% discount on purchases with their loyalty cards. The store advertises on the Internet and offers phone orders and deliveries.

On a recent day, an elderly woman in a wheelchair spent two hours looking for ordination supplies that she believed suited her grandson. There were also full-time monks dragging carts through the aisles, stocking up on what they need.

“It feels like real shopping,” said Kaesinee Bumpennorakit, 48, who was planning to invite monks to her house and purchased cushions, packaged alms and a set of altar tables for the occasion.