Subform Filter Problem

I have a subform that contains a column/field which shows a price. I have created a button which allows the user 2 options: Show all, Show lowest price. The menu button works fine for the Show lowest price - by pressing this the form filters all the records in the form and only displays the record with the lowest price.

My problem then is how to return to the original list of records. This should correspond to the filter, I have set in the SubFormLink. Can I use FILTERGROUP for this?? The user should be able to press the Show all button to return to the previous view of the records i.e. the view of SubFormLink.

Thanks for your help!