Terry and Margaret at Pinball life are awesome with customer service and prices. I've been ordering since I started collecting back in 2003. They ARE the cheapest to order parts from when comparing to others.
Set of standard Williams/Bally legs - Marco - $69, Pinball Life - $49
Lockdown bar Marco - $89, Pinball Life -$64
Sometimes the bigger suppliers have the harder to find things like artwork items but Pinball Life for Life!