We are an independent team. team registration is $150 and each event was $80. States was $150. You can calculate what you want to go to.
As far as parts, if you can use the school parts, great. That will save a ton. We found a kit from a disbanded team on ebay for roughly 20% of retail cost. I sold the parts we didn’t need and made the money back, so in our case the parts were free. We spent a couple hundred on more stuff we didn’t have in the kit.
You can make a field for much cheaper your own. See here.
PM me if you want other info.