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Ship the item from your own inventory to keep COGS at wholesale; a $55 yoga mat that costs you $18 looks premium yet limits spend. Pair it with a 20 % off code that expires in 72 h; redemption rates like clockwork hit 12-14 %, turning prize cost into immediate margin recovery.

Virgin sweep lasts 38 min on 100 Mbps; subsequent runs take 6–7 min because the hash diff is stored. Set it nightly, forbid «Photos» and «Offline» folders if you save RAW files there, and the cap won’t bulge until you dump another camera roll.

Zero-in a Goal That Aligns With a Trackable Metric Pin the campaign objective to one trackable action: 30 % more newsletter subs, 500 new product-tagged posts, or a 4-point bump in brand-sentiment score. Tie each prize tier to the metric—extra entry for every @mention, twice the odds when a friend subscribes, on-the-spot reward for dropping a five-star review. Stick a unique UTM on every share button and pipe the data into Google Looker Studio; refresh the dashboard every 60 min so you can kill under-performing posts before they burn budget. If the figure stalls, flip the CTA: trade "tag three friends" for "save this post"—Instagram saves flip 2.3× faster into profile taps according to 2023 Later study. Credit only verified actions; no partial credit, no lucky-dip draws. Finish with a 24-hour audit: dump the CSV, slice by source, audit each entry against the metric. Anything that doesn’t show in the column gets nuked—keeps the list pristine and the ROI real.

Host the deck on a under-6-bucks static site (Cloudflare Pages) and route it through a .me domain scored for $3 with Namecheap student coupon. Set cache-control: max-age=3600 so campus recruiters loading the site on shaky eduroam still see first paint in 15k"), message (textarea, 3 rows, maxlength="560"). Submit button: 56 px tall, full-width on direct link generator for Google drive pointing to your GitHub repo’s README anchor "#demo". Use utm_source=reach&utm_medium=mail&utm_campaign=w19 so Analytics will pinpoint the top-cloning subject line.