Hurricane Electric will give you a bunch of free /64s and a /48 to play with, which you can set up for tunneling on any IPv4 connection that doesn't block ICMP traffic to HE. You can set this up within a range of routers, but if your router doesn't support it, you can also set it up on most PCs (Windows and Linux for sure, for macOS you'll need to check, but I'm sure it'll be fine).

You can also use IPv6 locally by simply advertising a subnet from the right range (an ULA), which is also useful for maintaining internal addressing if you do get normal IPv6 but your ISP is a bunch of dickwads that rotate the subnets they hand out (likely to happen if they make you pay extra for a static IP right now).