Are you in the US? There's a bunch of places that are all essentially the same (even down to having the same interface and store layout). Bikebandit is fine, Babbitts Online is fine, on any of them you'll enter your model year and model, then it'll give you a set of exploded parts diagrams. Click through to find the parts in the section. They all have slightly different pricing and shipping costs.

In my experience, Bikebandit and Babbitts ship fastest (I think they keep things actually in stock), other places I've found slightly lower prices but waited a week for them to ship, making me suspect they order things in from Suzuki as they're ordered, so you have to wait for them to receive them and then reship them to you.

The diagrams will also give you the part numbers. If you only need one or two smallish things, it's worth putting the parts #s into ebay and seeing what you find. You can often find manufacturer-packaged stock parts on there with free or cheaper shipping. If the photos show sealed, Suzuki-branded packaging, it's usually legit.


Also check the marketplace here when you need things. Sometimes, someone will happen to be selling a used but functional option of the part you need probably a lot cheaper than a new replacement.  

Oh, lastly, if you're placing an order with one of the stock suppliers and you're closing in on the free shipping threshold (usually $100), there'll always be some extras that you'll need some time that you can use to tip you over. I like to have spares of some of the common and/or weird gaskets on-hand just in case I need them in a hurry (clutch-cover gasket, oil filter o-rings, that kind of thing). I'm sure others will have suggestions of other spares it worth picking up if you're ever in that "if I spend $8 more, I get free shipping and save $12" situation.

Oh, and happy riding! This bike is a real fun one to take apart. You'll have a blast.

suzukipartsmonster.com

I found Partzilla to be the cheapest but the slowest to ship.  I usually use BikeBandit or Rockymountainatvmc

Ron Ayers.  is another site. the exploded views are handy if you'can't remember how the parts go back together, like axle spacers on the front and rear wheels ,for example.