Radiation efficiency: 98%, Shell material: Imported PC + ABS, Center frequency: 5750MHz, Polarization: RHCP, Item number: Lollipop 3, Bandwidth: 500 MHz (5.5-6.0 GHz), Center frequency: 5.8 GHz, Matching: VSWR < 1.2 (at center frequency), Axial ratio: <3db, Weight: 3.7g, Gain: 2.5 Dbi, Antenna length: 60mm. Go down and check coupons out. Remember to check price history if it is available. Best price?
Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
Click here to search by yourself. Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. There is one coupon right now! Check this out.
Link: Banggood product page
1. ($24.77): Parts8
paste coupon code in your cart and click Apply after clicking “Proceed to checkout”. Click to copy code and open shop.
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BGBCFPV, BGBCBG10, BGFOX12, 502C6B, BGOTC21, BGBFCR13, BGCITYADS2019, 0e7f33, FBCOUPON1, BGSRRE, bGhOnEy10, BGTT10, BGFoxeer5, BGCuponation10, BGDAVIS
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Price history (for all/most countries) for 2Pcs Foxeer 5.8G Lollipop 3 Omni FPV Antenna is here. The lowest price was: $13.95.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).