Do you have an extended warranty?

你们有长期的质量保证吗？

Sign me up for the extended warranty.

给我再签一些保单。

I'll take this VCR with an extended warranty.

我要买这个VCR还有一个扩展的保修期。

We have an extended warranty available at extra cost.

对于额外价钱我们有较长的保证期限。

We have an extended warranty available at extra cost.

有较长的保证期限。