The price to give bride's family is called Pin Jin
.
There's no Market rate but its good for bride to discuss with her mum (and try to help out the groom *wink*). Both groom and you should know the budget and help out each other.
Typically, its either pin jin, or pin jin + wedding tables.
The pin jin is given to bride family during guo da li.
Usually the bride's parents will use the pin jin to buy the return gifts and also the rings/ necklace gifts to gift to the couple during Tea ceremony on actual day too
Oh yes- there's another price called "wash diaper money" that will be given when fetching the bride. It usually a token amount like 288 or 388.