create a select list that passes the price as the value, for example:
<select name="maxPrice" id="maxPrice">
<option value="500">Up to 500</option>
<option value="700">Up to 700</option>
etc...
</select>
the forms method should be set to post.
then in the recordset go to advanced view, set the SQL as:
SELECT * FROM content WHERE Price > 0 AND Price < paramMaxPrice
Next, create a parameter:
Name: paramMaxPrice
Type: Number
Default value: -1
Run Time value: $_POST['maxPrice']