I am planning to put plain white postcards, which you can buy cheaply at any stationery shop and writing option replies on the back.

For example:

We will/will not be able to attend your wedding on Friday 26th September 2003.

No of Guests ......

Vegitarian dish require: Yes/No

With our address written on the front but we will not be supplying the stamp as that will be expensive.

Beeny

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Friday 26th September 2003 - OMG, that's nearly 3 years ago!!!