loyalty card
e-card
coupon
voucher
token
stallholder
pedlar
vender
vendor
hawker
checker
checkout
cash desk
cashier
consumer
consumer goods
consumerism
customer
patron
regular customer
regular client
new customer
steady customer
turnover
annual turnover
business volume
sales volume
bargain
bargaining
bargain hunter
discount
reduction
discounter
cost
costs
cost-effective
costing
cost price
spending
spend
payback
payout
payee
drawee
receive
payer
appropriation
money
money box
piggy box
markdown
depreciation
closeout
sale
warranty
sell-by date
after-sales service
guarantee
handbill
datasheet
leaflet
poster
gimmickry
benefit selling
selling skill
sale technique
gimmick
trick
trade-in
special offer
special discount
rebate
refundment
reimbursement
exchangement
in exchange for
return product
swap
merchandise
goods
commodity
article
benefit
profit
margin
gain
phoney
sham
mockery
fake
real thing
honest goods
standard
standardization
specification
criterion
criteria
double standard
dual
canon