If you changed them yourself it is recommended that you get an alignment done or do the alignment yourself. If a shop or mechanic did the work they should have done the alignment themselves.
its not your struts you have to check your tire alinement's
Yes, cupping is caused by defective shocks/struts.
check the front shocks or struts to see if they are worn out, worn out struts could cause the front tires to hop at higher speed.
Sam's Club does not do front end alignments. They do sell tires and if your tires are wearing unevenly, they can tell you if a front end alignment is recommended.
check your struts sounds like they are worn out
A bad wheel bearing
Bad shocks and struts are a common failure that can cause diagonal wipe on tires, the shocks and struts may not be leaking and still cause this condition. Shock and strut replacement is recommended at 50000 mi.
Check the tread wear and pattern of wear on your tires. Worn tires can cause moderate to serious handling problems, gaining at different speeds of the vehicle. Also, uneven wear with shocks and struts can affect your handlin, in turn, wearing your tires as well.
Out of alignment or bad shocks or struts
Worn shocks and/or struts will cause cupped tires. There may be another suspension or chassis component worn, but the shocks/struts are the first components that should be inspected.
"Scalloping" is usually caused by bad struts. But, could also be from inproper alignment, lack of tire rotations (matinence, not motion), or even poor quality tires. I've known many people with Toyo tires that have this problem.
I paid about $200/strut ($125 parts, $75 labor).Cost to Replace Front Struts 2003 Accord:I just got a quote from Les Schwab tires and they quoted; Struts $94.47 each total $188.94Labor to install $41.25 each, total $82.50Four Wheel Alignment - $72.95Total of the replacement of the Front Struts - $344.39 plus tax.