Reader Katherine Thompson writes:
The company “Illoom Balloons” make light up balloons, if you hadn’t guessed. They have one range of balloons which say “Lets Party!” which are available in most supermarkets and department stores. I emailed them a few weeks ago and I’ve recently got back an email saying they’re adding an apostrophe to their range, and are sending me free balloons!
Unfortunately I don’t have a picture, but someone else might do considering they’re widely available, however the corner of this website shows the offending balloons: http://www.illooms.com/
I’d never heard of light-up balloons before — the video on the company’s web site makes them look pretty cool, though. And Katherine’s correct — right there on the home page, there are four balloons that say “Lets Party”.

Lets Party
Thanks for passing that along, Katherine, and thanks for contacting the company! You’re making my job easy!
Source: Illooms.com