Hair implant costs vary greatly, depending upon your location and how much is charged per graft, the amount of grafts you need to thicken or cover an area of your scalp, how dense you want the hair to appear, and it also depends on your actual hair type too.
Normally you pay per graft.
 More recently, costs have dropped quite a bit due to new procedures in hair implants and typically you can find prices ranging from $3 to $8 per graft.
 Previously a section of your scalp would be removed, usually from the back of your hair or wherever the hair is thickest on the head, and then the individual hairs prepared for implanting.
 Now days with more modern procedures, hair can be extracted from the head one at a time, and transplanted into another section.
This method is less costly, thus making hair implants much less expensive than they used to be.
Once you know how many individual implants you will need to have to cover your balding areas you will be able to determine how much you will need to pay.
 Most likely you will need to have a consultation first, and then decide, based on the final costs, what you can afford.
 Perhaps, rather than having a full head of hair, you might be happy with thinner coverage that will cost less.
 There are also hair implant calculators online that can help you get an approximation of how much it would cost for a hair implant and you can get an idea of the total costs or the difference in cost you would need to pay based on how full the coverage is.
 It is not a cheap procedure, but it does give the best results and is the fastest way to get a full head of hair again.