another +1 for elastic laces. I've used these
http://www.amazon.co.uk/XTENEX-Auto-Blocking-Elastic-Black/dp/B001BRYKAM/ref=sr_1_9?ie=UTF8&qid=1415079652&sr=8-9&keywords=elastic+laces
I just bought 10 sets of lock laces from eBay for £0.99 each:-
http://www.ebay.co.uk/itm/Jogging-Running-Triathlon-Sports-Elastic-Shoelaces-Locking-Laces-Trainers-/191216461554?pt=LH_DefaultDomain_3&var=&hash=item2c8563a6f2
They took 3 weeks to arrive from China (as advertised) but that's hardly bad for 99p per pair and free postage.
@kboy started
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another +1 for elastic laces. I've used these
http://www.amazon.co.uk/XTENEX-Auto-Blocking-Elastic-Black/dp/B001BRYKAM/ref=sr_1_9?ie=UTF8&qid=1415079652&sr=8-9&keywords=elastic+laces