Oytier-Saint-Oblas is a small agricultural commune with no major paid attractions, so most of your spend will be transport, lodging, and food rather than tickets or tours. The village rewards self-catering, slow days on foot or by bike, and treating Lyon or Vienne as the occasional splurge rather than the default base.
Because public transport is genuinely thin here, the biggest budget decision is whether to rent a car. With a vehicle you can hit Chartreuse producers, Vienne markets, and Lyon day trips on your own schedule; without one, taxi and bus connections will quietly inflate your per-person cost more than any gîte.