Set aside

• "Buy now, pay later" option
• Payment plan
• Certain payment plan
• Department-store plan
• Department-store plan, perhaps
• Kind of plan
• Buying plan with a down payment
• Alternative to immediate purchase

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
1961, as a system of payments for merchandise, from lay (v.) + away . Earlier in the same sense was Australian lay-by (1930).

Wikipedia Word definitions in Wikipedia
Layaway ( lay-by in Australia, New Zealand) is an agreement in which the seller reserves an item for a consumer until the consumer completes all the payments necessary to pay for that item. Rather than taking the item home and then repaying the debt on ...