Here's a link with info about the collection, tour hours, etc. It doesn't appear there is a charge, unless you want to also see the Rhody garden. On this site, there is also a link to Weyerhaeuser's press release on the closure.

Here is a link that might be useful: Bonsai Collection website

The bonsai collection will reopen for Mother's Day weekend as part of Federal Way's Buds and Blooms festival. They had agreed to be part of the festival before the decision to close was made, and they are going to honor it. If you can't make it this month, you have two more days, but be warned. A lot of people come Mother's Day weekend.