Earlier this week I received an email asking for advice on an inexpensive quick release system to move a video rig from a slider to a stabilizer. Simply because I would have to first suggest going with a Manfrotto 577 Quick Release system, especially if you're already working with a compatible Manfrotto tripod head. Unfortunately the OEM Manfrotto 577 Quick Release base plate + qr plate system runs anywhere from $50-$60 dollars each (seen here).
Manfrotto 577 Rapid Connect Adapter with Sliding Mounting Plate (501PL)
Here's an old video showing you the alternative from Calumetphoto. The Calumet branded QR system looks exactly and works exactly like the Manfrotto 577, except that it only runs $35 dollars full retail.
If you're ever lucky as i've been in the past, you can apply a Calumet discount code bringing the price down for as low as $25 dollars (complete base + plate). Unfortunately I don't have a discount code available now, but it's still much cheaper than the OEM Manfrotto 577.
[UPDATE] CALUMET COMMENTED ON THIS ARTICLE. USE THE PROMO CODE 'CHEESY' FOR $10 OFF/EACH! (good until Feb 18th Midnight)
The last few times i've checked these quick release systems were out of stock. Today i've found that the Calumet Quick Release base plate is available again (found here).
Calumet Quick-release Video Head Adapter
. They work great, and people have been buying them since. While a Manfrotto 577 can run you just over $50 bucks, the Calumet version runs about $34.99. Not bad savings, but wait there's more! ("You following me camera guy"). 
right? It sure could be, but guess what - it's not Manfrotto. On sale right now this QR adapter sells for about 40% of the Manfrotto price. The specs over at the Calumet website doesn't state anything about being Manfrotto compatible or as a Manfrotto replacement part. I called the store and they weren't even sure if it was. 
