I looked at their pricing as compared to the site I have used and while it is a little less (a couple of dollars on a $300 price) I don't think it is too good to beleive. You will want to look carefully at their shipping costs as that can be a way they make back what they discount up front. Good luck and let us know how it goes.
Haven't used specific website but mercedespartsdelivered.com - you pay sales tax for florida but shipping is usually lower than other sides and very competitive prices. Used them a couple of times with no problems - not the fastest one but everything arrived well packed in about a week.
Drivers caught in confusion surrounding new clean air zones
Different data sources put some cars in emissions ‘no-mans land’ as Birmingham and London clean air zones at odds with each other
Authorities running clean air zones in two UK cities are using emissions data from conflicting sources...