I don't mind spending money to unlock mechs and weapons.  So what are the best deals that you can get in mech arena for your money.  For example, is it cheaper to buy a 3 star weapons from the neon shop versus waiting for a sell on the same 2 star weapons then buying an upgrade pack to upgrade it? I think the upgrade packs aren't really worth it since you still have to use a coins to rank up.  I don't want to wait and "grind" for the materials but i like most weapons at 4 or 5 stars before I use it regularly.  Any helpful advice on this topic would be much appreciated!!