Chicken wings are a bit of a con really, most of the weight is from the bones.
You might find it more cost effective to buy a whole chicken and cut it down? Depends where you shop.
i'll give you guys some insider knowledge, my restaurant actually got chicken wings for free from 2 of our suppliers for several years. now i think demand has increased or the cost of chicken has gone up and they have now started to sell them, so we no longer get any for free. they are also extremely fatty and yes a lot of the weight is bones.
i remember in fact there was a place in town that used to do 50 chicken wings for £5, cooked and on a platter, it was a pub/restaurant, im talking about 4 years back maybe, but that place has since shut down.
i also talked to a chef who also owned a restaurant and yeah he basically used to give wings free away with big orders because he used to have so many of them (he used to order full chickens and cut them up) and there was little demand, he has since sold his restaurant on.
im guessing places which sell a lot of boneless chicken products such as asda, their butchers must be throwing out a lot of chicken wings, you could try asking, but i dont know if they cut the chicken on site or it comes delivered already cut. because i dont see asda caring too much about them and are prepared to make a loss on the wings due to the profit made from everything else. would be extremely hard to find out, might need to get friendly with the right butcher and see if you can give him a backhander.