Before worrying about the cost of glasses, look for a 3D
television that will suit the family. Spend some time to find one
that is comfortable to watch, realistic and one that doesn't cause
eyestrain for anyone in the family..
Glasses cost only a few dollars so the difference in cost
between one make and another should be negligible. If you are very
concerned about the cost of glasses, you may be better off looking
at Vizio, a very low cost and basic 3D television that will leave
money for glasses later.