If you search Amazon and eBay, you will find a ton of shock selections, ranging from $21 for all 4 (cheap, more than likely straight from china), to $40 (again, more than likely cheap chinese shocks), to well over $100 for 4. The cheap chinese big bore shocks arent necessarily bad, but, they do at times, depending on which ones, need more maintenance than some of the more expensive ones. While i dont own a Traxxas, this is the set i get for most of my trucks: https://www.ebay.com/itm/282293062084 They work pretty good, are adjustable, and seem to hold up fairly well, but, they will need shock oil. For shocks, you can either do a search for Bandit or Rustler shocks, or, if you have a micrometer (easiest way i have found to do it), you can take the shocks off and measure the eye to eye length, which is typically listed in MM's, and just search for shocks that length. For most vehicles, you can get just the springs, but you have to know things like spring rate, length, and rebound. With Traxxas, you can easily find that info listed on most spring kits. For tires, a search for Bandit or Rustler tires will yield a ton of options, from cheap to very expensive. Traxxas has huge parts and aftermarket support, so finding anything for them shouldn't be too hard. For my brushed cars, i just find tires on eBay. If you look, you can find premounted sets (meaning the tires are already glued to the wheel), for an average price of $30 for all 4. Yes, they are cheap, but, for brushed cars, they arent bad. Here is what i found on a search on eBay for the Bandit: https://www.ebay.com/sch/i.html?_fr...&LH_PrefLoc=1&rt=nc&LH_ItemCondition=3&_pgn=1
