Scarlett Johansson's tennis necklace starts at just $TK during this sale. Backgrid/YouTube/@CBSMornings Bling for less has a nice ring to it. Celeb-loved BaubleBar has just kicked off its Big Summer Event — offering 20% off sitewide, plus exclusive $10 stacking bracelet deals . The on-trend jewelry brand is a hit with celebs and editors alike , with highlights including the waterproof necklace set Ali Larter wears and the Scarlett Johansson-loved Billie Tennis Necklace — a style so cute, we had to have it too . BaubleBar Billie Gold Tennis Necklace BaubleBar The latter sparkly necklace is available in gold or silver metal options, plus varying lengths and stone sizes. Johansson’s version is the 15-inch, 18K gold-plated sterling silver option with 2-millimeter stones — which is currently on sale for $120.…