BikeCloset.com has some really good deals, for example, on Ale bibs: Bibs and Shorts – Bike Closet
I bought my Selle Italia SLR Kit Carbonio Superflow saddle for $159, which is cheaper than the going price of the version with titanium rails.
$10 shipping per order which is easily defrayed especially when buying multiple items.
Website is somewhat disorganized compared to the bigger online retailers like:
Competitive Cyclist - Road, Gravel & Mountain Bikes;
Excel Sports | Shop Online From Boulder Colorado;
BikeTiresDirect - Great prices on bicycle tires, components, apparel.
I have also bought stuff from overseas websites:
All4cycling | Cycling clothing and bike accessories
Bikes & Bicycle Accessories at Merlin | UK Online Bike Shop (merlincycles.com)