I guess there will be a forum user who can lent that much of testnet coins here, you just have to wait though or else try some testnet faucet site you can find a lot of it online.
Or you can try this one suggested by BitCryptex.
Why don't you create your own testnet blockchain? It will be much easier than asking a few faucets to send you that many coins. Use
bitcoin-testnet-box for that. It shouldn't be difficult for you if you have a basic knowledge of Linux commands and bitcoind installed.
Most of the faucets only giveaway very small amounts of coin, which most likely covers most use cases.
I am aware of running my own local testnet and I have already done that. however I am doing some work on lightning network and i need to connect to open many channels to various nodes on the network.