we use domitor and ketamine, with an opioid (buprenorphine/torb depending on level of analgesia and additional sedation needed), then maintain with isoflurane. We never induce with isoflurane as it really stings the eyes and nose, so use it to maintain anaesthetic only after injectable induction. Mask inductions using isoflurane are very stressful too so bunnies release catecholamines (stress-linked hormones) which can lead to irregular heart rhythms so standard procedure is now to get them asleep with injectable anaesthetics and keep them asleep with iso. Most practices won't list Isoflurane on an invoice as it is difficult to quantify how much is used as it is volatile, not a set liquid amount, it is usually charged as 'X minutes anaesthetic' or within the cost of neutering.
As an aside we would never consider using Atipamazole (Antisedan) intravenously, didn't realise people still did this :shock: