If you decide you want something portable (as long as it's just around the office) I bought an internal (because it's cheaper) Pioneer BDR-212 Blu-ray burner and a SATA-to-USB3 adaptor cable for about £80 all in. Sits on a bit of foam. Easy enough to move from room to room. Does a great job.
iMac (19,1, 3.1 GHz i5, 12.7.4, 40 Gb RAM); MacBook Air (1.8 Ghz, 8 Gb RAM, 10.14.6, 256 Gb SSD) Vodafone router and Devolo Wi-Fi Extender, Canon TS8351 printer/scanner.
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