JBL Go 4, Ultra-Portable Waterproof Bluetooth Speaker IP67 (Black) $34 (RRP $59.95) + Delivery ($0 Prime/ $59 Spend) @ Amazon AU

Retailer (per OzBargain): Electrical & Electronics. Features: Delivers clear, powerful JBL Pro sound with rich, punchy bass Integrated loop makes it easy to carry anywhere Waterproof and dustproof, so it's perfect for carrying on the go Can be … - Spotted on OzBargain's front page. Click through to see the discussion + votes.