5100's are $180 from DSMS (down south motorsports) with free shipping
plus coils ~$160 for OME coils
Plus the $100 assemble charge from wheelers, and that's $440 without shipping, taxes, and whatever else he adds to the cart
And I terms of assembly... Putting springs together really isn't that hard, you can't rent compressors (crappy but they do work) from Advance Auto. So that $100 assembly tag turns into a $10 (that's returned when you return the tool).. Sooo basically that assembly charge goes to $0.