Can do better than that: £5 a year with HostMedia.
If you can be bothered signing up four times, you could probably get their one-domain-only no-monthly-fee plan for 4×£1 setup for what you need.
The default is generally 302, which is non-permanent (i.e. re-checked with each request).
A permanent redirect is only as permanent as any caches involved, so not as irreversible as the name might suggest.