1) you are free to sell your electronic products on instalments
2) most electronic stores allow payment in easy instalments
3) you would be governed by provisions of the contract act
4) enter into agreement with the purchaser to protect your interest . Take post dated cheques
5) in the event of default in making payment and cheques are dishonoured file complaint under negotiable instruments act
6)contract should contain a clause that you can take possession in event of default in making payment and auction the same and sue for recovery of balance amount