You are in luck. There are several locations where you can purchase a skd steer attachment. I highly suggest that you visit the following: http://www.skidsteersolutions.com/Skid_Steer_Attachments_Skid_Loader_Attachments_s/9339.htm.
There is a Blog Spot blog page called Skid Steer Solutions which has a blog with an in depth review on some skid steer attachments. The review is thorough, but not overly long. You can also read one on a blog site called Skid Steer Attachments Blog.
Yes, there are skid steer attachments for John Deere. They are also available for other manufacturers such as CAT. Some fit several brands and come in standard sizes/models.
The best product to buy for an ASV Skid Steer depends on each customer and what their needs are. Some of the best-selling products are backhoe attachments, skidsteer hammers, and skidsteer sweepers.
This website has some for sale! The internet almost always has what you need. :) http://ur.rousesales.com/Category.aspx?category=Skid+Steer+Loaders+-+Attachments&cid=10720
Skid steer rental can be rented at a local Industrial Supplies and Equipment store near your area. They will have good selection of skid steer rental.
A good place to search for used skid steer is online. Several sites offered used skid steer. Some of these sites include www.machinerytrader.com, www.texasskidsteer.com and of course ebay.com
You can find skid loader attachemnts at several locations online. I have provided a list of the following locations for you: http://www.skidsteersolutions.com/ and http://www.bobcat.com/.
Some Bobcats are considered skid steer loaders. It depends on the model Bobcat a person is taking into consideration. The Bobcat M-series S300 is a skid steer loader, as where the T300 and the A300 are not.
Some Bobcat skid steer loader models include the S150, S850 and S630. Bobcat has a neat section on there website that allows buyers to compare features and find the correct model to suit their needs.
A skid steer loader's cost varies. According to http://business.shop.ebay.com/Skid-Steer-Loaders-/95494/i.html , it seems that it could range from $5,000 to $20,000. The dimensions also vary too. If you need a smaller one, you can get a compact skid steer loader.
Skid steer enclosures can be purchased both online and in retail stores that specialize in large machinery. There are even some that specialize in skid steers and accessories.
You can buy a used skid steer loader at many places online. Some examples are http://www.equipmentlocator.com/elsm/skid-steers.htm and http://www.machinefinder.com/ww/en-US/category/used-skid-steer-loaders.