Reserve for Christmas, perhaps

• Purchase plan
• "Buy now, pay later" option
• Alternative to immediate purchase
• Set aside
• Purchase payment plan
• Department-store plan
• Shopper's plan

Wiktionary Word definitions in Wiktionary
n. 1 Things which have had a deposit placed on them and which the owner (generally a store) has agreed to hold for the customer and accept full payment at a later time. 2 The system of accepting a deposit and holding for a customer to complete purchase. ...

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 ...

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).