When you get your search results, wait a few seconds before selecting any of the options such as "Newest results first" as there's a throttle on how often you can search. Do it too quick and you'll be told you have to wait and you may have to start your search again...
What would be good is if the titles had a conformity about them, for example:
£500 - Brand - Model - 4/5 String - Delivery Type/Pickup Only
...and sold items were moved to a sub-forum. This would also allow you to sort the channel by the title and see everything in value order so you could go straight to your budget bracket.