Claro, sem problema.
Eu fiz esse nó de forma que é só alterar a url, no nó http-request, para o posto do seu interesse. O resultado te dá o valor da gasolina, com os valores em R$ já com 2 casas decimais.
[{"id":"50710bd3ae852690","type":"inject","z":"13a11bc58fb374e4","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"","payloadType":"date","x":1320,"y":4700,"wires":[["ef80042b46e1b17d"]]},{"id":"ef80042b46e1b17d","type":"http request","z":"13a11bc58fb374e4","name":"","method":"GET","ret":"txt","paytoqs":"ignore","url":"https://precodoscombustiveis.com.br/pt-br/station/brasil/sao-paulo/santo-andre/district/posto-carrefour/15743","tls":"","persist":false,"proxy":"","authType":"","senderr":false,"x":1470,"y":4700,"wires":[["26d2c0396aa9404b","19bd7b1f28ab9d60"]]},{"id":"26d2c0396aa9404b","type":"html","z":"13a11bc58fb374e4","name":"Selector","property":"payload","outproperty":"payload","tag":"#Gasstation > div.row.py-5 > div.offset-xl-1.col-xl-7.col-12.p-5.p-md-0 > div:nth-child(2) > div:nth-child(1) > div > div > div > div > span.price","ret":"html","as":"single","x":1620,"y":4700,"wires":[["7fc90e51c1484e23"]]},{"id":"19bd7b1f28ab9d60","type":"html","z":"13a11bc58fb374e4","name":"Date","property":"payload","outproperty":"payload","tag":"#Gasstation > div.row.py-5 > div.offset-xl-1.col-xl-7.col-12.p-5.p-md-0 > div:nth-child(2) > div:nth-child(1) > div > div > div > div > span:nth-child(3)","ret":"text","as":"single","x":1610,"y":4760,"wires":[["280e22cdd8a2e70e"]]},{"id":"280e22cdd8a2e70e","type":"change","z":"13a11bc58fb374e4","name":"updated at","rules":[{"t":"set","p":"payload","pt":"msg","to":"payload[0]","tot":"msg"}],"action":"","property":"","from":"","to":"","reg":false,"x":1770,"y":4760,"wires":[["8ee7d850c6c52437"]]},{"id":"7fc90e51c1484e23","type":"template","z":"13a11bc58fb374e4","name":"nome do posto","field":"topic","fieldType":"msg","format":"handlebars","syntax":"mustache","template":"Posto Carrefour","output":"str","x":1780,"y":4700,"wires":[["deef933ed9c2fe9b"]]},{"id":"8ee7d850c6c52437","type":"delay","z":"13a11bc58fb374e4","name":"","pauseType":"delay","timeout":"100","timeoutUnits":"milliseconds","rate":"1","nbRateUnits":"1","rateUnits":"second","randomFirst":"1","randomLast":"5","randomUnits":"seconds","drop":false,"allowrate":false,"outputs":1,"x":1930,"y":4760,"wires":[["67f6f475c7e93c76"]]},{"id":"deef933ed9c2fe9b","type":"function","z":"13a11bc58fb374e4","name":"Função","func":"topic = msg.topic\nvalue = msg.payload[0]\n\nvalue = value.replace('R$ ', '')\n\nvalue = Math.round(value * 100) / 100\n\nvalue = value.toString().replace('.', ',')\n\nmsg.payload = topic + ': R$' + value\nreturn msg;","outputs":1,"noerr":0,"initialize":"","finalize":"","libs":[],"x":1940,"y":4700,"wires":[["67f6f475c7e93c76"]]},{"id":"67f6f475c7e93c76","type":"join","z":"13a11bc58fb374e4","name":"","mode":"custom","build":"string","property":"payload","propertyType":"msg","key":"topic","joiner":", atualizado ","joinerType":"str","accumulate":false,"timeout":"1","count":"","reduceRight":false,"reduceExp":"","reduceInit":"","reduceInitType":"","reduceFixup":"","x":2110,"y":4700,"wires":[["2ba7995370e7a992"]]},{"id":"2ba7995370e7a992","type":"debug","z":"13a11bc58fb374e4","name":"Valor da gasolina","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"payload","targetType":"msg","statusVal":"","statusType":"auto","x":2270,"y":4700,"wires":[]},{"id":"e15aa844a32934ca","type":"comment","z":"13a11bc58fb374e4","name":"Basta alterar o nó http request para a página do posto","info":"","x":1440,"y":4640,"wires":[]}]
Testa aí e me diz se deu certo!