They shoukd be happy with that, it probably came out to more than just giving cash. It costs around $900 to get mid grade all terrain tires on my truck
Worked out to about $600 a piece, but back in the day my parents did the same thing for us kids. Once we got older buying presents seemed silly for adults, but helping out with important items never gets old.
Those really are the gifts that become more important as people get older. I'm glad my wife's parents were able to help us out many times...there were occasions where we would basically go shopping at there house so that we would have food