100 BTC is a lot, but in case you can't find anyone willing to send you that much (heck, that's just about what most faucets have in balance actually), you can try this one for about 0.1BTC plus (so maybe you could do it ten times for 1 BTC?). I've started you out on one claim.
https://coinfaucet.eu/en/btc-testnet/All other faucets are too small, probably not helpful. Why not just try mining the testnet coins? Am sure you could get that amount with less effort.
And you can just return the coins to the same faucet address for all of them, that's usually how it works since you don't need them again.